Tubular Truss – Joint B – Gapped K Connection

HSS Design Manual - Example 4-1.5

References

Ericksen, Jason, et. al HSS Design Manual, Volume 4:Truss & Bracing Connections. Glenview, IL: Steel Tube Institute, 2017.

Details

From the reference:

Full Truss Design Example – Round Members. For Joint B, the branch loads differ by more than 20% - therefore this is not a pure K connection. Branch members transmit part of their load to the other branch (as a K connection) and part through the chord to resist the applied point load (as a cross connection). The strength of the connection is determined by linear interaction of the proportion of the branch load involved in each type of load transfer.

Refer to the figure in the reference for additional details.

Results

Table 1.
Parameter RAM Connection Reference Difference
K Connection – Chord wall plastification (kips) 367.68 368 None
K Connection – Shear yielding (punching) (kips) 507.76 508 None
Cross connection – Chord plastification (kips) 305.35 326 6%1
Cross Connection – Shear yielding (punching) (kips) 507.76 508 None
Weld design –Intermediate result – le 24.5 24.5 None